CN104234730B - The extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for - Google Patents

The extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for Download PDF

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Publication number
CN104234730B
CN104234730B CN201410440058.8A CN201410440058A CN104234730B CN 104234730 B CN104234730 B CN 104234730B CN 201410440058 A CN201410440058 A CN 201410440058A CN 104234730 B CN104234730 B CN 104234730B
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China
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base plate
anchor
tunnel
hole
creating
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CN201410440058.8A
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Chinese (zh)
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CN104234730A (en
Inventor
杨本生
王华斌
孙利辉
高斌
王仲永
李辉亮
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河北工程大学
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Abstract

The present invention is a kind of for the extremely broken base plate fast pore-creating method of anchor note technology controlling and process deep tunnel, for adopting in the serious pucking process of high stress tunnel of bolt-grouting support control deep, very easily there is collapse hole, hole wall argillization when creeping into grouted anchor bar/anchor cable hole in extremely broken base plate (plate destructing depth is greater than 3��8m), Cheng Kongnan, boring is difficult to reach the problem of design requirements. First present method uses welded steel plate cube mold; Secondly the hole roughly the same with mould specification is dug in advance at broken base plate place; Finally cube mold is put into hole, determine that rational concrete specification builds mould according to concrete engineering is actual, mold removal after concrete coagulation, to building near coagulation knoll and smooth process, reach tunnel section design requirement, thus it is that broken base plate forms good borehole conditions. The method is simple to operate, easy construction, is particularly suitable in the construction in extremely broken base plate fast drilling grouted anchor bar/anchor cable hole.

Description

The extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for

Technical field

The present invention relates to one and note the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel for anchor, be applicable to deep tunnel pucking serious, base plate fragmentation or extremely fragmentation, grouting and reinforcing need to be adopted to administer the permanent tunnel of pucking.

Background technology

China's coal-mine shallow portion resource exhaustion increasingly in recent years, turn to deep mining gradually, deep rock mass is in the environment of " three high disturbances " (high-ground stress, high ground temperature, high karst water and strong digging disturbance), geologic condition and mechanical environment are very complicated, roadway surrounding rock is caused to be difficult to keep stable, a large amount of on the-spot investigation also shows, major part mine is for saving support cost, ignore base plate supporting, base plate is caused to become the space of high-ground stress release, pucking is very serious, and base plate is often in pole broken state. Domestic existing many mines adopt bolting and grouting support control base plate, this technology closed bottom breaking surrounding rock, it is to increase the cohesion of floor strata so that base plate residual strength promotes, and can effectively administer pucking. Creeping into effective grouting hole is the most important condition that anchor note technique is implemented smoothly, but when creeping into grouting hole in extremely broken base plate, very easily occurs that rubble pours in, bit freezing, collapse hole phenomenon occur, and the easy argillization unstability of hole wall, causes into porosity very low.

Summary of the invention

The present invention provides a kind of and is applicable to deep tunnel, base plate fragmentation or the roadway floor boring method extremely broken, the length of service is longer, energy much slower boring difficulty, it is to increase become porosity.

Technical solution problem of the present invention adopts following technical scheme:

The present invention provides a kind of and notes the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel for anchor, and its feature carries out as follows:

(1) after tunnelling, tunnel is carried out first support and secondary supporting, make tunnel form permanent supporting tunnel 11, reinforce for floor grouting and form good environment.

(2) according to base plate anchor Design requirement, need base plate to install carry out near grouted anchor bar (rope) place smooth, with hand drill (air drill), installation place is carried out fragmentation, after broken, breaking up rock (coal block) is removed.

(3) concrete mold is put into hole, make mould upper limb equal with roadway floor, reach tunnel design requirements.

(4) mould is built, with concrete, mould inside is built, in casting process, suitable hand drill (Steel Reinforcing Rod etc.) stirs, make the even filling of mould inner concrete, to the smooth process of die surface concrete after building, after mould inner concrete condenses, (about 1��2 day) carries out next step construction.

(5) build near coagulation knoll, after mould inner concrete condenses, grinding tool is taken off, build near clump, and make to build surface and be roughly in same plane with clump, after building concrete coagulation (about 1��2 day), clump is holed, grouted anchor bar (rope) 10 etc. is installed.

In step 1, roadway support adopts domestic comparatively ripe anchor rete cord+W steel band combined supporting, it is ensured that side country rock in top, tunnel is stablized, for roadway floor construction provides good construction environment.

In step 2, base plate needs grinding depth about 600mm, and long �� wide is about 800mm �� 800mm, facilitates grinding tool to pass in and out. Base plate fragmentation can adopt hand drill ZM15 (air drill MQT-120/130) etc.

In step 3, mould length �� wide �� height is 600mm �� 600mm �� 600mm, is made up of straight carbon steel Rimmed Steel Sheet (GB3274-88), steel plate thickness 5mm, upper and lower section opening, adopts engineering line to make cross section place and base plate on mould be in same plane.

In step 4, concrete strength proportioning can adopt C20, C25, C30, determines according to floor grouting pressure, it is proposed that adopts C30.

Stirring in step 4 and adopt hand drill ZM15 etc., reinforcing bar material can adopt discarded anchor pole, anchor cable etc.

In step 4, the standard of concrete coagulation is that after mold removal, coagulation knoll is in steady state.

Building near coagulation knoll in step 5, concrete strength adopts the intensity proportioning identical with building mould.

In step 5, boring can adopt DZQ-100 type baseboard anchor cable rig or ZLJ-660 all-hydraulic tunnel drilling rig, rig all has the function of percussion drilling and rotary drilling, percussion drilling is adopted during grouting hole perforate, make coagulation knoll is formed rapidly boring, when hole depth is about 100mm, use middling speed rotary drilling instead, when hole depth is about 1m, start lower bar, adopt high speed rotary drilling, until hole depth arrives requires whole hole.

The one of the present invention is used for the extremely broken base plate fast pore-creating method of anchor note technology controlling and process deep tunnel: base plate rig creeps in grouting hole process, coagulation knoll makes roadway floor form the stable rock stratum of subrange, decrease rig and landing landwaste around hole wall is repeated shattering process, enhance the integrity of hole wall simultaneously, brill bits are carried at washing fluid lower flow out smoothly along the circular clearance between hole wall and drilling rod outside surface, avoid freely not cause owing to brill bits row is logical and bore the increase of slag accumulation area thickness, high pressure washing liquid rinses the bit freezing of initiation for a long time, collapse hole, the phenomenons such as hole wall argillization occur, improve into porosity.

The unusual effect of the present invention is, for the problem that deep tunnel law of deformation and breakage is serious, combine with grouting and reinforcing floor lift control theory, the method that construction is simple, cost is low is provided for extremely broken base plate creeps into grouting hole, the method makes broken base plate formation stablize rock stratum among a small circle, thus improve grouting hole, grouted anchor bar (rope) Completion of Drilling Hole rate, solve the problem that broken base plate boring is difficult.

Accompanying drawing explanation

Fig. 1 is the broken base plate fast pore-creating mould figure of the present invention;

Fig. 2 is the present invention's broken base plate fast pore-creating construction tunnel sectional drawing;

Fig. 3 is the broken base plate Cheng Konghou design sketch of the present invention;

Fig. 4 is the broken shallow portion grouting hole figure of base plate of the present invention;

Fig. 5 is broken base plate fast pore-creating grouted anchor bar (rope) figure of the present invention;

Number in the figure: 1 base plate; 2 dig pit in advance; 3 waterwayss; 4 grouting holes; 5 rail beams; 6 anchor cable bundles; 7 Grouting Pipe; 8 foldings; 9 nuts are fixed; 10 grouted anchor bars/anchor cable; 11 permanent supporting tunnels; 12 coagulation knolls;

Specific construction technique

Now by reference to the accompanying drawings and for certain ore deposit, the technical scheme of the present invention is described in detail: the present invention is that the extremely broken base plate of a kind of deep tunnel is drilled to grouting hole method fast, mainly for adopting in the serious pucking process of high stress tunnel of bolt-grouting support control deep, very easily collapse hole during extremely broken base plate rig grouting hole, hole wall argillization, the difficult hole-forming phenomenon such as bit freezing, such as, certain track lane, ore deposit is positioned at mine western part, tunnel buried depth is 800m, belong to deep mining, between the 1000m-1500m of this tunnel, floor lift in gallery is bigger, and this section of tunnel is subject to the mining influence of two working faces in both sides, so being badly in need of Control of floor, track lane design section is stalk Semicircular tunnel, net section 4200mm �� 3900mm, top, tunnel and two is helped to adopt anchor girder net spray combined supporting. supporting parameter: top board adopts �� 20 �� 2400mm twisted steel anchor rod, two help to adopt �� 18 �� 1800mm rod bolt, an array pitch 800mm �� 800mm: vault anchor cable is often arranged and put 3, anchor cable length 8000mm, an array pitch 1800mm �� 1600mm, W steel band is used to connect between anchor pole, the concrete that surface injection 100mm is thick, base plate determines to adopt " shallow portion slip casting+deep slip casting " method to reinforce, and needs to creep into a large amount of grouting hole in construction process, and specific embodiment of the invention step is as follows:

(1) tunnel first carry out planted agent reach design section requirement, i.e. wide �� height=4200mm �� 3900mm, base plate is risen end 500mm simultaneously; Then base plate carries out grouting and reinforcing, as shown in Figure 2, is dug in advance roadway floor by grouting position, is formed and digs pit 2 in advance, and placing coagulation knoll mould length �� wide �� height is 800mm �� 800mm �� 600mm, as shown in Figure 1. Dig in advance in engineering at base plate, adopt air drill MQT-130 that base plate is broken, and rubble is cleaned out.

(2) concrete mold is placed on digs pit in 2 in advance, place smooth after with C20 concrete, it is built, casting process stirs with discarded reinforcing bar, it is made evenly to be full of mould, until 24 as a child after, concrete coagulation mold removal, builds near coagulation knoll 12, make itself and base plate roughly be in same plane, can hole after thoroughly condensation.

(3) tunnel boring is arranged as shown in Figure 3, comprises shallow portion grouting hole 4 and grouting cable anchor hole 6, and wherein base plate shallow portion grouting hole 4 adopts 7655 type pneumatic hammer constructions, drilling depth 1.5m; Anchor cable boring 6 application DZQ-100 type baseboard anchor cable rig Drilling, borehole diameter 100mm, drilling depth is determined according to plate destructing depth.

(4) carry out the slip casting of shallow portion according to design requirements, anchor cable, deep anchor cable bundle slip casting etc. are installed, thus reach the effectively control serious pucking problem of deep tunnel.

Rapid drilling administers pucking technological process: planted agent reaches design requirements �� base plate and digs in advance and form mould of digging pit in advance �� place and carry out building �� get mountain mould �� build near coagulation knoll �� hole.

Claims (7)

1. note the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel for anchor, it is characterized in that carrying out as follows:
(1) after roadway excavation, help to carry out supporting to tunnel top board and two so that it is form permanent supporting (11);
(2) planted agent digs in advance, according to base plate anchor Design scheme, needs base plate to install smooth process near grouted anchor bar or anchor cable place, with hand drill or air drill, installation place is carried out fragmentation, after broken, breaking up rock or coal block are removed, formed and dig pit (2) in advance;
(3) cubes coagulation knoll, puts into hole by concrete mold, makes mould upper limb equal with roadway floor, is fixed by mould, built by mould with C30, forms coagulation knoll (12); The concrete specification that mould is built is determined according to concrete grouting parameter, and when shallow portion grouting pressure is when 3��4Mpa, it may also be useful to C20, when adopting medium and deep slip casting, grouting pressure, when 7��8Mpa, adopts C30;
(4) after coagulation knoll (12) solidifies 1��2 day, mould is taken off, build near coagulation knoll, make base plate smooth;
(5) on coagulation knoll, grouting hole (4) is crept into according to design, after becoming hole, actual according to concrete engineering, Grouting Pipe (7), grouted anchor bar or anchor cable are installed, after slip casting completes, carry out sealing of hole.
2. the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for as claimed in claim 1, it is characterized in that: the tunnel top board and two described in step 1 helps permanent supporting to adopt domestic comparatively ripe anchor rete cord+W steel band combined supporting, it is ensured that side country rock in top, tunnel is stablized.
3. the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for as claimed in claim 2, it is characterized in that: the planted agent described in step 2 digs in advance, planted agent's size designs hair section size according to tunnel, it is ensured that reach design requirements after forming permanent supporting.
4. the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for as claimed in claim 3, it is characterized in that: the scope length of the fragmentation described in step 2 �� wide �� height is 800mm �� 800mm �� 600mm, and concrete mold can be facilitated to pass in and out.
5. the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for as claimed in claim 4, it is characterized in that: the fragmentation of the base plate described in step 2 can adopt hand drill ZM15 or air drill MQT-120/130.
6. the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for as claimed in claim 5, it is characterized in that: the standard that in step 4, coagulation knoll solidifies is that after mold removal, coagulation knoll is in steady state, and has certain intensity.
7. the extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for as claimed in claim 6, it is characterized in that: in step 5, the mode of creeping into of grouting hole is percussion drilling perforate, perforate drill bit size is selected by design requirements, after creeping into concrete pier and being about 100mm, adopt rotary drilling method, big pump amount, rotate to middling speed at a slow speed, suitably pressurization, when drilling depth is about 1m, namely floor strata it has been drilled into, start lower drilling rod, pump amount in employing, at a slow speed to fast rotational, intensified pressure a little, it is limited not suppress pump, until drilling depth reaches the whole hole of requirement.
CN201410440058.8A 2014-08-29 2014-08-29 The extremely broken base plate fast pore-creating method of technology controlling and process deep tunnel noted by a kind of anchor that is used for CN104234730B (en)

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6216319B2 (en) * 1982-02-24 1987-04-11 Michio Kimura
CN101839140B (en) * 2010-03-31 2012-05-23 中国矿业大学 Method for reinforcing roadway floor by grouting
CN202500525U (en) * 2012-02-15 2012-10-24 中国矿业大学 An anti-collapse apparatus for rock holes by grouting and congealing walls of holes
CN102797478B (en) * 2012-08-27 2015-03-11 中国矿业大学 Method for preventing bottom squeeze of soft rock roadway by using distributed shear-resistant slip-resistant reinforced concrete pile
CN102996149B (en) * 2012-11-21 2015-03-11 山东科技大学 Support method for bolt-grouting composite crushing dynamic-pressure roadway soft rock roof by high-pre-stressed anchor cable
CN103291326B (en) * 2013-07-05 2015-08-19 河南理工大学 A kind of roadway with large deformation country rock reproduces bearing bed control technology
CN103410542B (en) * 2013-08-08 2016-05-04 中国矿业大学 Improve the device and method of roadway floor anchor shaft anchor cable pore-forming efficiency and anchoring property
CN103850693A (en) * 2014-03-24 2014-06-11 河南理工大学 Method for controlling high ground stress roadway heaving floor

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